Use word boundary for list

[zaibacu]

Switch from (^\s) to \b should solve several corner cases

[codecov]

Codecov Report

Merging #91 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   92.82%   92.82%           
=======================================
  Files          13       13           
  Lines         669      669           
  Branches      115      115           
=======================================
  Hits          621      621           
  Misses         34       34           
  Partials       14       14           

Impacted Files	Coverage Δ
rita/engine/translate_standalone.py	90.21% <100.00%> (ø)

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